A.in a bookstoreB.in a hospital

C.in a libraryD.in the teachers' office

A.twice a yearB.once a year

C.twice a half yearD.once a half year

A.Yes, it's right.B.No, it's wrong.

C.That's right.D.All right.

A. a 15-days B. a 15 days C. a15-day D. a 15-day's

－ About 4000 RMB.

A.How longB.How farC.How muchD.How often

A.littleB.a littleC.severalD.much

A. Give them to him, please. B. Thank you very much. C. I don’t like it.

A.winterB.springC.summerD.autumn

A. You’re welcome. B. Sure, I will. C. Certainly not.

A. No problem. B. It’s my pleasure. C. Yes, please.